I am a bit distressed - could anyone please confirm if providing a copy of my bank statement is proof enough that I have paid an invoice sent to me last year? A business is threatening legal / QCAT action against me for an invoice they claim I didn't pay. I have found my bank statement that proves I paid it and sent a copy to the business, but they want to go ahead with QCAT or legal action they say, as they can't find a record of the payment at their end. Is this my problem or theirs? By chance if it goes further, will I need to provide anything else? Will I need to organise a trace or anything? Will QCAT accept my bank statement as is? Or am I ok because of my proof? Just a bit worried - I am too old for this sort of worry when I know I did the right thing. Just wondering how far I might have to go to prove it, etc. Thank you very much.